Molybdenum-based nitrogen carrier for ammonia production via a chemical looping route
Yang, Song 1Zhang, Tan 1Yang, Yanyan 2Wang, Bixi 1Li, Jin 3Gong, Zhouting 1Yao, Zhengyue 2Du, Wenguang 1Liu, Shoujun 1Yu, Zhongliang3
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作者信息
1. Taiyuan Univ Technol
2. Shangrao Normal Univ
3. Engn Ctr Civil Clean Fuel
折叠
Abstract
Chemical looping ammonia synthesis (CLAS) is an innovative and effective method for sustainable ammonia generation, in which efficient N release/fixation of nitrogen carriers (NC) is required for successive ammonia production. Herein, we report a two-step CLAS mediated by a Mo2N-Mo couple and experimentally validate its N fixation and N release steps under mild conditions. In the N-release step, the NH3 production rate at 450 degrees C (> 4576 mu mol g(-1) h(-1)) was three times higher than that obtained via the thermo-catalytic ammonia synthesis route catalyzed by Mo2N. In the N-fixation step, the introduction of H-2 enhanced the reaction kinetics between Mo and N-2, accelerating NC regeneration. In addition, only a slight deactivation of NC was observed during the 8-cycle stability test. This study confirmed the preliminary feasibility of using Mo2N as an NC during the CLAS process.
Key words
Chemical looping ammonia synthesis/Molybdenum-based nitrogen carrier/Ammonia/Nitrogen release/Nitrogen fixation/THERMOCHEMICAL SYNTHESIS/CATALYSTS/NITRIDE/COBALT/STATE/WATER/GAS/XPS
NSTL
Elsevier